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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cb59230189848705e879f30becf7698ef3dddf87f32f86d1facefce23d360e' 
  AND token = 'GeP9i/wsjC5yB5YNsM8TAQVjb7yC7fcIf7C7ckBY5kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}